text: /* Main simulator entry points specific to Lattice Mico32.
     Contributed by Jon Beniston <jon@beniston.com>
     
     Copyright (C) 2009-2015 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include "sim-main.h"
  #include "sim-options.h"
  #include "libiberty.h"
  #include "bfd.h"
  
  #ifdef HAVE_STDLIB_H
  #include <stdlib.h>
  #endif
  
  static void free_state (SIM_DESC);
  static void print_lm32_misc_cpu (SIM_CPU * cpu, int verbose);
  static DECLARE_OPTION_HANDLER (lm32_option_handler);
  
  enum
  {
    OPTION_ENDIAN = OPTION_START,
  };
  
  /* GDB passes -E, even though it's fixed, so we have to handle it here. common code only handles it if SIM_HAVE_BIENDIAN is defined, which it isn't for lm32.  */
  static const OPTION lm32_options[] = {
    {{"endian", required_argument, NULL, OPTION_ENDIAN},
     'E', "big", "Set endianness",
     lm32_option_handler},
    {{NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL}
  };
  
  /* Records simulator descriptor so utilities like lm32_dump_regs can be
     called from gdb.  */
  SIM_DESC current_state;
  
  /* Cover function of sim_state_free to free the cpu buffers as well.  */
  
  static void
  free_state (SIM_DESC sd)
  {
    if (STATE_MODULES (sd) != NULL)
      sim_module_uninstall (sd);
    sim_cpu_free_all (sd);
    sim_state_free (sd);
  }
  
  /* Find memory range used by program.  */
  
  static unsigned long
  find_base (bfd *prog_bfd)
  {
    int found;
    unsigned long base = ~(0UL);
    asection *s;
  
    found = 0;
    for (s = prog_bfd->sections; s; s = s->next)
      {
        if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
  	  || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
  	  || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
  	  || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
  	{
  	  if (!found)
  	    {
  	      base = bfd_get_section_vma (prog_bfd, s);
  	      found = 1;
  	    }
  	  else
  	    base =
  	      bfd_get_section_vma (prog_bfd,
  				   s) < base ? bfd_get_section_vma (prog_bfd,
  								    s) : base;
  	}
      }
    return base & ~(0xffffUL);
  }
  
  static unsigned long
  find_limit (bfd *prog_bfd)
  {
    struct bfd_symbol **asymbols;
    long symsize;
    long symbol_count;
    long s;
  
    symsize = bfd_get_symtab_upper_bound (prog_bfd);
    if (symsize < 0)
      return 0;
    asymbols = (asymbol **) xmalloc (symsize);
    symbol_count = bfd_canonicalize_symtab (prog_bfd, asymbols);
    if (symbol_count < 0)
      return 0;
  
    for (s = 0; s < symbol_count; s++)
      {
        if (!strcmp (asymbols[s]->name, "_fstack"))
  	return (asymbols[s]->value + 65536) & ~(0xffffUL);
      }
    return 0;
  }
  
  /* Handle lm32 specific options.  */
  
  static SIM_RC
  lm32_option_handler (sd, cpu, opt, arg, is_command)
       SIM_DESC sd;
       sim_cpu *cpu;
       int opt;
       char *arg;
       int is_command;
  {
    return SIM_RC_OK;
  }
  
  /* Create an instance of the simulator.  */
  
  SIM_DESC
  sim_open (kind, callback, abfd, argv)
       SIM_OPEN_KIND kind;
       host_callback *callback;
       struct bfd *abfd;
       char **argv;
  {
    SIM_DESC sd = sim_state_alloc (kind, callback);
    char c;
    int i;
    unsigned long base, limit;
  
    /* The cpu data is kept in a separately allocated chunk of memory.  */
    if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
  
    if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
    sim_add_option_table (sd, NULL, lm32_options);
  
    /* getopt will print the error message so we just have to exit if this fails.
       FIXME: Hmmm...  in the case of gdb we need getopt to call
       print_filtered.  */
    if (sim_parse_args (sd, argv) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
  
  #if 0
    /* Allocate a handler for I/O devices
       if no memory for that range has been allocated by the user.
       All are allocated in one chunk to keep things from being
       unnecessarily complicated.  */
    if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
      sim_core_attach (sd, NULL, 0 /*level */ ,
  		     access_read_write, 0 /*space ??? */ ,
  		     LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
  		     0 /*modulo */ ,
  		     &lm32_devices, NULL /*buffer */ );
  #endif
  
    /* check for/establish the reference program image.  */
    if (sim_analyze_program (sd,
  			   (STATE_PROG_ARGV (sd) != NULL
  			    ? *STATE_PROG_ARGV (sd)
  			    : NULL), abfd) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
  
    /* Check to see if memory exists at programs start address.  */
    if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
        == 0)
      {
        if (STATE_PROG_BFD (sd) != NULL)
  	{
  	  /* It doesn't, so we should try to allocate enough memory to hold program.  */
  	  base = find_base (STATE_PROG_BFD (sd));
  	  limit = find_limit (STATE_PROG_BFD (sd));
  	  if (limit == 0)
  	    {
  	      sim_io_eprintf (sd,
  			      "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
  	      free_state (sd);
  	      return 0;
  	    }
  	  /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
  	  sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
  	}
      }
  
    /* Establish any remaining configuration options.  */
    if (sim_config (sd) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
  
    if (sim_post_argv_init (sd) != SIM_RC_OK)
      {
        free_state (sd);
        return 0;
      }
  
    /* Open a copy of the cpu descriptor table.  */
    {
      CGEN_CPU_DESC cd =
        lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
  			    CGEN_ENDIAN_BIG);
      for (i = 0; i < MAX_NR_PROCESSORS; ++i)
        {
  	SIM_CPU *cpu = STATE_CPU (sd, i);
  	CPU_CPU_DESC (cpu) = cd;
  	CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
        }
      lm32_cgen_init_dis (cd);
    }
  
    /* Initialize various cgen things not done by common framework.
       Must be done after lm32_cgen_cpu_open.  */
    cgen_init (sd);
  
    /* Store in a global so things like lm32_dump_regs can be invoked
       from the gdb command line.  */
    current_state = sd;
  
    return sd;
  }
  
  void
  sim_close (sd, quitting)
       SIM_DESC sd;
       int quitting;
  {
    lm32_cgen_cpu_close (CPU_CPU_DESC (STATE_CPU (sd, 0)));
    sim_module_uninstall (sd);
  }
  
  SIM_RC
  sim_create_inferior (sd, abfd, argv, envp)
       SIM_DESC sd;
       struct bfd *abfd;
       char **argv;
       char **envp;
  {
    SIM_CPU *current_cpu = STATE_CPU (sd, 0);
    SIM_ADDR addr;
  
    if (abfd != NULL)
      addr = bfd_get_start_address (abfd);
    else
      addr = 0;
    sim_pc_set (current_cpu, addr);
  
  #if 0
    STATE_ARGV (sd) = sim_copy_argv (argv);
    STATE_ENVP (sd) = sim_copy_argv (envp);
  #endif
  
    return SIM_RC_OK;
  }
  